Apparatus for drafting locomotives



3 Sheets-Sheet l D. M. 'LEWIS I APPARATUS FOR DRAFTING LOCOMOTIVES July 7, 1925.

Original Filed Oct. 29, 1918 July 7, 1925. 4 l 1,545,434

D. M. LEwls APPARATUS .FOR DRAWING LocoMTIvEs 0rizina1 Filed oct. 29, 1918 s sheets-she`et 2 fram/frs.

July 7, 1925.

D. M. LEWIS APFARATUS Fon DRAFTING LoGoMoTIvEs 3 Sheets-Sheet 5 i /A/VEWTO/P W/ Tf1/ESS Patented .uly 7, 1925..

UNITED" STATES.

PATENT OFFICE.-

DAVID M. L EWIs, or TQPEKA, KANSAS, QAssIGNon, Br fmanorANI) MESNE .assIe'NK- MENTS, T0 LEWIS DRAFT PILIANCE C0., OF

TION 0F ILLINOIS.l

CHICAGO, .I,I.I.I 1\ToIs,"AV conrom- AIJPARATUS Fon `nnAiarINcr LocoMoTIvEs.

Application mea oetoberas, 191s, seriai No. 260,139. `Renewed January 19, l1925.

To all whomz't may concern.'

Be it known that I, DAVID M. LEWIS, a citizen of the United States, residing at Topeka, in the county of Shawnee and State of Kansas, have invented certain new and useful Improvements in` Apparatus for" Drafting Locomotives, of which the following is a specification.

My invention relatesto the provision of an improved means whereby the locomotive, or otherI form of boiler, is drafted ata low pressure, low velocity, large volume, and aps proximately continuous draft, in contradistinction to the standard practice of drafting.

I accomplish the foregoing and secure kthe advantages herein set forth by means `of a construction, the preferred embodiments of which I have illustrated in the accompanying drawings, wherein:

Fig. 1. is the longitudinal section through the front end or smoke box of the locomotive; Fig. 2. is the section taken on the line II-II of Fig. 1; Fig. 3 is a plan view on an enlarged scale of the nozzle stand or casting; and Fig. 1 is an irregular section on the line IV-IV of Fig. 3.

Referring now to the construction shown in Figs. 1. and 2, the smoke box or front end is indicated by the reference letter A, such smoke box being of standard.construc-y tion with the exception that it is `provided with a widened stack, 7, and a similarly widened petticoat, 8, the width of which is approximately equal to` the, width of the flue sections, 9. The major axes of the stack and petticoat are transverse of the smoke box. An expansion chamber, B, is located in front of the smoke box, in position *to reV ceive the exhaust steam from the cylinders (not shown) through the nozzle stand C the construction of which will be described. The expansion chamber discharges into the stand C, immediately above which is located the exhaust nozzle, 14, such nozzle having a long narrow discharge opening, 15, the area of which is approximately equal to the area of the inlet opening, 11, by means of which the exhaust steam is lead into the expansion chamber. The area of they discharge opening in the nozzle, therefore, is greater than the area of the exhaust nozzle opening of standard designs, particularly charge. The "nozzle, 14, which is `ofapproximately the samev width as the expanfy sion' chamber, 'is provided with an annular passage, 16, cored out inits walls, and with a plurality of jets, 17, communicating therewith. Blower pressurek is supplied to the chamber', 16, by means of the pipe, 18, Fig. 2 and Fig.v 4, for use-when desired.

. The usual dry pipe, 19, and steam pipes, 20fare provided.

' The nozzlestand or casting C is in the general-shape of an elbow, the vertical leg of which is adapted to be fastened to the saddle casting (not shown) and lthehorizontal leg of which extends forwardly in the lower part of the smoke box and is coupled to 'the expansion chamber, B. Thepcasting, C,- is provided with two passages, 11A which conduct the exhaust steam from they cylinders into the expansion chamber, B, at a point beneaththe baffle orwall, 22, which extends part way Vtoward the horizontalcentre line of the expansion chamber, `as indicated in Fig. 2. Immediately above'` the passages, 11A, the casting, C, is provided with two ad# ditional passagesk `or. channels, 11B, which communicate with `the' interior of the expan sion chamber at a point abovev the baflle,22,

1,545,43zif such channels, 11B, expanding laterally from p the front to the rear and terminating in a verticalchannel or discharge opening, 11C,

reducing the back pressure, permitting lowV nozzle pressure and a low pressure substantially constant exhaust of low velocity but large volume, which as it enters the petticoat and stack of large volumetric capacity produces the uniform vacuum` conditions throughout the smoke box and hence in the flues and fire box.

The draft blast is in the form of a thin, wide column giving maximum 'entrainment area and it is substantially continuous in character. The effect lof the expansion chamber is to iron out the pulsations of the exhaust from the cylinders, such pulsations disappearing at the higher speeds.

Thereth ot thesteem ie. as totonsr Thef tette tearing the? einen entete the lower part of the expansion chamber through the channels or passages, 11A2 e-'Xpans aroulndhe baHeEZ', filling'th pacejther'eabove, after which it enters into the passages, 171B, into the dischargieolutlet 1.12, and

then is discharged froiin'th'nozz e 4.

.The Castia-s Q.- ..orsts. ninemsn Olor. struction to the smoke box and to the flow oct gases therethrough and access may be had to.'` the interior through the Central; opening the, expansion chamber. lThe,location ot the expansion. Chamber. exterior ofthe smoke leon4 is also. adrantageous es 'it time affords noobstruotton auditorio. loev increased to. any

size found necessary to pnoduoethe desired results in a given locomotive.

Ig 'claim l'. In a locomotive draft appliance, the

Y combination of: an, expansion chamber 10- having a' Passe-se therethrough roi; contruccingV exhaust steam tothe eXpansionchamber and a second passage ifor "conducting the exhaust steam from thek expansion chamber to the stack, the expansion chamber having openings registering. with said` passages,y together. with means'for. 'preventing the? steam discharging into. the vexpansionchamber from directly entering the second: passage.

4. In a locomotive the combination oifan expansion chamber having.v an? inlet` andA an outlet opening, a balilel in the expansion chamber.' 5 preventing direct communication between saidf two iopenings, andf'aA nozzle @asias haengt. pesage ,reigetaiee with Sal inlet. Tenemos for' Conductas exhaust steam to the expansion chamber and a second, Passage mastering. with Said. outlet orthse for toetuttne exhaust Steele 'to'il'l tlreexpansion'chamber.'` f

5. In a locomotive'the combination of an expansion chanaber having an inlet and an oiitlt 'openi'ng5'a baffle in the expansion @hentai orereetine direot oonmuHCet-on between said two openings, and a nozzle casting having a passagel registerngytth said inlet openingtol eondnctng exhaust steam tothe expansion chamber', and a seoond passage, registering `with said'i outlet opening, lfor conducting exhaust. steam. from the expansion chamber, said second passage increasing in'A Width andi decreasingy in its other dimension into a xvide nozzle.

6, In a locomotive the combination of. an expansion chamber located exteriorly oi'4 the smoke boxfandfa nozzle casting having, an elbow for, connection xvijththe saddle. casting and having a passage for discharging exhaust steam into the, expansion chamber',

said passage extendingA substantially horizontally from the elbow to. the expansion chamber, and said casting havingf a second passageway. leading rearwardly from its forward end and terminatingin a long', narrow' nozzle for discharging the steam from thefexpansio'n chamber, said. cast-ing being constructed at its forwardend for attaohment. to the expansion chamber.

7; In a locomotive the combination ot an expansion chamber. located extei'iorly. of. the

hereunto signed my name.

D. M. Lewis. e

Elli 

